Abstract

CVD diamond represents a very attractive material for the fabrication of devices based onthermionic emission, due to the possibility to achieve a very low or even negative electron affinity(NEA) by a hydrogen surface termination.We present here a preliminary study on thermionic conversion from diamond thin films grown ondifferent substrates, ranging from silicon to engineered ceramic materials. In particular, amongthem, HfC-based ceramics have been selected for its integration with diamond in concentrated solarsystems. CVD polycrystalline and nanocrystalline diamond films were deposited by MW-CVD(MicroWave-Chemical Vapour Deposition) by varying also their doping.Thermionic performance was evaluated in an ultra-high-vacuum (pressure <10-8 Torr)characterization setup able to accurately control the emitter and collector temperatures.Experimental activity has been carried out to integrate the HfC-diamond system in a more complexconversion module that was tested in a concentrating solar system to verify the conversionperformance under operating conditions. These results are finally reported.

Autore Pugliese

• Cicala Grazia

Tutti gli autori

• A. Bellucci; P. Calvani; E. Cappelli; G. Cicala; M. Girolami; D. Sciti; L. Silvestroni; D.M. Trucchi

Titolo volume/Rivista

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Anno di pubblicazione

2014

ISSN

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ISBN

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Numero di citazioni Wos

Nessuna citazione

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Numero di citazioni Scopus

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Ultimo Aggiornamento Citazioni

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Settori ERC

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Codici ASJC

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